Which marketing strategy helped Duolingo achieve a $2 billion valuation by transforming user engagement in language learning?

In the competitive world of language learning platforms, marketing strategies can make or break a company's success. Major language learning brands invest heavily in their marketing campaigns to capture market share in this growing industry. This poll tests your knowledge of how language learning companies have leveraged consumer psychology and strategic product launches to achieve remarkable success. Can you identify the marketing breakthrough that transformed one company's fortunes?

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